Examples of bacteria include Streptococcus, Staphylococcus, and Esherichia coli, commonly known as E. coli. All of these bacteria are pathogenic and cause infection in humans and animals. However, there are non-pathogenic bacteria as well.
Bacteria are living organisms that are comprised of one cell. Under a microscope they can have the appearance of rods, spheres or spirals. They are so small that over 1,000 bacteria could fit on a single pencil eraser. Approximately 1 percent of all bacteria found in the world are pathogenic. The rest are either helpful to humans or the world's ecosystem. Helpful bacteria can digest food for humans, synthesize vitamins and protect humans from disease.Learn More
Prokaryotic organisms fall into two domains: bacteria and archaea, which contain autotrophs and heterotrophs. Regardless of domain, prokaryotes share common traits of being single-celled organisms that are the smallest and simplest in composition and structure of all organisms. Prokaryotes are further divided into groups within their domains; both groups contain heterotrophs and autotrophs, and a variety of species.Full Answer >
When preparing bacteria for observation with a microscope, heat fixing the smear on the slide kills the bacteria to stop the potential spread of disease and adheres the smear to the slide. After heat fixing, the smear is stained.Full Answer >
Phagocytic cells respond to invading bacteria, regulate the inflammatory response, defend against parasites and play a role in allergic reactions. There are three different cells that work as phagocytes, including eosinophils, neutrophils and monocytes, all of which are white blood cells.Full Answer >
Bacteria do not have any cell walls, however, all bacteria have a protective cell membrane that encases their cytoplasm. Genetic data and other biological structures essential for cell function are found in cytoplasm.Full Answer >